Thread-gage.



C. L. BAILEY.

THREAD GAGE.

APPLICATION man 1x1/111.11.1914.

Patented May 4, N15.

A TTOR/VEYS tilt LSSASS.

CHARLES LOUIS BAILEY, OF GLEN' RlDGE, NEW JERSEY.

THREAD-enen.

Specification of Letters Patent. i

Patent-ed May d, ll.

Application led March 17, 1914. Serial No. 825,372.

To all whom t may concern: g

Be it known that lf, CHARLES LOUIS BAILEY, a citizen ofthe United States, and a resident of Glen Ridge,'in the county of Essex and State of New Jersey, .have invented a new and Improved Thread-Gage, of which the following is a full, clear, and exact description.

The invention relates to measuring instruments, and its object is to provide a new and improved thread gage more especially designed for use by machinists and other mechanics and arranged to enable the user to quickly and accurately determine whether the thread of a screw, bolt, tap or similar threaded article, is of the correct size or not. In order to accomplish the desired result use is made of gage members having V- shaped edges spaced apart and between which a screw or other threaded article to be gaged is passed to determine whether the threaded article is of the correct size or not. A practical embodiment of the invention isrepresented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.-

Figure 1 is a side elevation of the improved thread gage; Fig. 2 is a plan View of the same with a screwto be gaged in position in the gage; Fig. 3 is a sectional plan view of the thread gage on the line 3-3 of Fig. 1; Fig. 4 is a sectional side elevation of part of the thread gage on the line 4;-4 of Fig-2; Fig. 5 is a cross section of the thread gage on the line 3f-5 ot Fig. l: Fig.

6 1s a perspective view of the body of the thread ga e; and Fig. 7 is a side elevation of amodi ed form of the thread gage.

' The body or stock A of the thread gage is U-shaped in its upper portion, and is pro vided at the members of the said upper portion withrecesses or guideways A", A in which tit gage members B and C spaced apart in the opening of. the stoclr. A. for the passage of a screw, bolt, tap or similiar threaded article D to be gaged. rlhe gage member B is formed of two superimposed plates B and` B2 each provided with V- sha ed edges to form between the said" edges` a t -shaped groove corresponding to the V- shaped thread of the article D to be gaged, as plainly indicated in Fig. 2. Tlhe gage member B issecured in place in the recess A' by screws E which also pass through a cap plate A8 held on the stock and covering thefront facesof the gage members B and C. i

The gage member C is formed of two plates C and C2 located oneabove the other andv having V-shaped edges disposed directly opposite the V-shaped groove formed by the plates B', B2 of the gage member B. The V-shaped edges of the plates C', C2 are adapted to pass between adjacent threads of the article D, as plainly indicated in 2.

can readily determine whether the article is of correct .size or not, for if the article passes all the way through the gage members B and C then the diameter of the article is smaller than intended. The plates C' and C? are provided with slots C, C4 .(see Fig. 4) through which extend screws F, F' also passing through the cap plate A to hold the plates C', C2 vsecurely in `place in the recess A.

ln order to properly adjust the plates C', C2 use is made of set screws Cr screwing in the -side of the cap plate A3. adjacent the recess A2, the inner ends of said set screws abutting against the outer ends of the plates C', C2. rFhus when the screws F, F' are loosened the plates C', C2 can be adjusted to gage articlesof a predetermined size. practice, about four gages will be necessary for gaging threaded articles such as mentioned, from eight to forty threads per inch. @ne gage will be arranged to accommodate threaded articles from 8 to 13 threads to the ,while the abutment member A4 carries the set; screws Cf. As shown in the drawings, the cap plate A3 is preferably fastened in place on the body A by a screw Trl and a dowel pin l lto permit convenient removal of the cap plate A3 for changing the gage members B and C whenever it is desired to do so. lt is further understood 

